Attempt to index local "class" (a boolean value)

Solar2D General Questions/Discussion
#1

I am running into problems while learning the sdk. I am following this tutorial http://www.flemingermedia.com/2012/03/14/create-a-calculator-with-corona-p-1/ on how to build a calculator. I think the problem is the tutorial is a little bit old so I am sure a change in the sdk has made it no longer run. About 40% through the first page he asks you to run the code you have which should generate a button with the number 5 in the middle of it. However when I run it I am getting an error. 
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Here is the main lua file
 

--require the button constructor class local btnClass = require "buttons"; ------------------------ --define text parameters ------------------------ --create the parameter table local testParams = {}; --add parameters to the table testParams.labelTxt = "5"; ------------------------ --create a test button ------------------------ local tempButton = btnClass.newBtn(testParams) ------------------------ --position the test button at the middle of the screen ------------------------ tempButton.x , tempButton.y = display.contentWidth\*.5 , display.contentHeight\*.5;

and here is the button class lua file 
 

local class = {}; function class.newBtn(params) --this function creates a new generic button --get parameters or set defaults local width = params.width or 50; local height = params.height or 35 local labelTxt = params.labelTxt or ""; local bgColor = params.bgColor or {100,100,200}; local txtColor = params.txtColor or {255,255,255}; --our button display object local btn = display.newGroup(); --button background local bg = display.newRoundedRect(0,0,width,height,4); bg:setFillColor(bgColor[1],bgColor[2],bgColor[3]); --position the bg bg:setReferencePoint(display.CenterReferencePoint); bg.x , bg.y = 0,0; --insert the background to the button group:insert btn:insert(bg); --create the button's label local label = display.newText(labelTxt,0,0,native.systemFont, 18) label:setTextColor(txtColor[1],txtColor[2],txtColor[3]); --position the label label:setReferencePoint(display.CenterReferencePoint); label.x , label.y = 0 , 0; --insert the label into the button group btn:insert(label); btn:setReferencePoint(display.CenterReferencePoint); return btn; end

Any help on figuring out what is happening would be great

#2

The error “btnClass (a boolean value)” means that that variable is set to true or false somewhere in the code. Can you do a search and see where there are references to the btnClass variable?

#3

You need to return something in button class lua file, or it will return true if the module was succesfully loaded, or false if not.

at the end of the button class lua, add
 

return class;
#4

Thanks for the answer hachisoft, there were a few other issues after that one (mostly due to this being made before 2.0 graphics engine) but once I sorted that out it worked great! thanks

#5

The error “btnClass (a boolean value)” means that that variable is set to true or false somewhere in the code. Can you do a search and see where there are references to the btnClass variable?

#6

You need to return something in button class lua file, or it will return true if the module was succesfully loaded, or false if not.

at the end of the button class lua, add
 

return class;
#7

Thanks for the answer hachisoft, there were a few other issues after that one (mostly due to this being made before 2.0 graphics engine) but once I sorted that out it worked great! thanks